1940:
Seeking an alternative to ASCAP, a group of radio industry leaders
forms Broadcast Music Inc. (BMI) as the second U.S. performing rights
organization. BMI now represents more than 300,000 songwriters and
publishers, with about 4.5 million compositions.

1941: Guitarist Les Paul designs and builds one of the first
solid-body electric guitars (Adolph Rickenbacker had marketed a
solid body guitar in the 1930s; Leo Fender was also a pioneer in
solid body electric guitar design). The Gibson Les Paul guitar,
introduced in 1952, becomes one of the most popular models.

1941: Woody Guthrie joins the Almanac Singers, a folk group
with a decidedly leftist political passion formed the previous year
by Pete Seeger, Lee Hays and Milliard Lampell. Over the next year
or so the group performed with the likes of Leadbelly, Josh White,
Burl Ives, Sis Cunningham and Bes Hawes.

After recording just two albums -- the anti-war "Songs for
John Doe" and the pro-labor "Talking Union" -- the
members of the Almanacs were blacklisted for their political associations
and activities. They disbanded in 1942, but had already paved the
way for generations of folksingers to come. Seeger and Hays later
formed the Weavers, while Lampell became a successful songwriter
and novelist. The prolific Guthrie wrote hundreds of songs that
are entrenched in the fabric of America, including "This Land
Is Your Land," and made numerous recordings, mainly for Folkways
and RCA.

1942:
Crooner Bing Crosby, already a major star, performs the Irving Berlin
song "White Christmas" for the movie musical "Holiday
Inn," in which he also co-stars. The song wins an Academy Award,
and goes on to become one of the best-selling records of all-time.

1944: Aaron Copland debuts his American folk music-inspired
"Appalachian Spring," written for Martha Graham's dance
company. The work wins a Pulitzer Prize and emerges as a popular
concert performance piece on its own, eventually becoming one of
the most widely known 20th-century classical compositions.

1944:
Jazz promoter Norman Granz borrows $300 to put on a jazz concert
at the Philharmonic Auditorium in Los Angeles. The concert and its
many sequels give prominence to concert jam sessions and put live
jazz recordings on the map. Illinois Jacquet, Les Paul, J.J. Johnson,
Nat King Cole and Red Callendar are among the players.

Subsequent national tours and recordings through 1957 (many still
available on Verve) will be seminal in the development of bebop,
and give wide exposure to such giants as Charlie Parker, Dizzy Gillespie,
Lester Young, Benny Carter, Ben Webster and Oscar Peterson, among
many others.

1947: With a $10,000 investment from his dentist (Dr. Vahdi
Sabit), Ahmet Ertegun founds Atlantic Records with Herb Abramson
of National Records.

1947: The 12-inch 33 1/3 RPM LP record is invented, introduced
to the public the following year by Columbia.

1949: RCA-Victor develops and releases the first 45 rpm record
to the public.

1949:
After stints with bebop pioneer Charlie Parker, Miles Davis joins
with arranger Gil Evans to create the legendary album "The
Birth of the Cool" (Blue Note), the trumpeter's first major
recording and the precursor to the cool-jazz movement.

Throughout his career, the insatiably curious Davis would plunge
into new territory, including hard bop, modal jazz (epitomized by
his 1959 Columbia album "Kind of Blue"), jazz-rock electric
fusion (beginning with 1969's "In a Silent Way" and climaxing
with "Bitches Brew," recorded the same year) and jazz-funk
fusion (the brilliant 1972 album "On the Corner"). Not
only a stunning horn blower, Davis would become a profound bandleader
whose members -- from John Coltrane to Wayne Shorter -- would go
on to their own acclaim as a result of his tutelage.

1949: Hank Williams debuts on the "Grand Ole Opry"
performing "Lovesick Blues" and is called back to the
stage for an unprecedented six encores. "Lovesick Blues"
stays at No. 1 on Billboard's country singles chart for 16 weeks.
Williams remained with the Opry until 1952 when he was fired from
the cast. A year later, he died at age 29.